require 'rmagick'

imgl = Magick::ImageList.new
imgl.new_image(250, 250, Magick::HatchFill.new('white', 'LightCyan2'))

gc = Magick::Draw.new

# Draw the circle
gc.fill_opacity(0)
gc.stroke('red').stroke_width(3)
gc.circle(125, 125, 25, 125)

# Draw a little gray circle on the perimeter
gc.stroke_width(1)
gc.stroke('gray50')
gc.circle(25, 125, 28, 128)

# Draw a dot at the center
gc.fill_opacity(1)
gc.circle(125, 125, 128, 128)

# Annotate the dots
gc.font_weight(Magick::NormalWeight)
gc.font_style(Magick::NormalStyle)
gc.fill('black')
gc.fill_opacity(1)
gc.stroke('transparent')
gc.text(132, 125, "'125,125'")
gc.text(32, 125, "'25,125'")
gc.draw(imgl)

imgl.border!(1, 1, 'lightcyan2')
imgl.write('circle.gif')
